leon_kennedy_(re4).zip

This download looks like an addon. You need to extract the downloaded zip and put the addon folder in your Garry's Mod addons folder. You should end up with a directory structure similar to below:

• steamapps
  • common
    • garrysmod
      • garrysmod
        • addons
          • Leon Kennedy (RE4) <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• Leon Kennedy (RE4)/
  • info.txt
  • materials/
    • leon_kami_n.vmt
    • leon_kami_n.vtf
    • leon_tex.vmt
    • leon_tex.vtf
    • pl0004.vmt
    • pl0004.vtf
    • pl0004_n.vtf
    • pl0005.vmt
    • pl0005.vtf
    • pl0005_n.vtf
    • pl0011.vmt
    • pl0011.vtf
    • pl0011_n.vtf
    • pl0012.vmt
    • pl0012.vtf
    • pl0012_n.vtf
    • pl0013.vmt
    • pl0013.vtf
    • pl0014.vmt
    • pl0014.vtf
    • pl0014_n.vtf
  • models/
    • leon.dx80.vtx
    • leon.dx90.vtx
    • leon.mdl
    • leon.phy
    • leon.sw.vtx
    • leon.vvd
    • leon.xbox.vtx
  • settings/
    • spawnlist/
      • leon_kennedy.txt

Dante_Gamer, [Insert Cringe Here], Greenie, alandiego26, navivolyrk666, eduardmaslov97, angelxd999, davidcgchikaron, xWraithlordx, reivelmr, amskyblugamer75, ethandoniego, Padekkan, sebasr_96, cairesisaque, cairesisaque, otaviopereira09, OkabeRintaro